Honto no Jibun (ホントのじぶん; True Self) is Buono!'s 1st single. It was released on October 31, 2007, in Japan under the Pony Canyon label in two different versions, regular and limited, the latter of which included an additional DVD. The Single V version was released on November 21, 2007.

The title song was used as the first ending theme for the Shugo Chara! anime, and "Kokoro no Tamago" was used as the opening theme.

The single reached #5 on the Oricon charts and charted for twelve weeks, selling 42,035 copies. The single V reached #38 on the Oricon charts and charted for two weeks, selling 6,090 copies.